Boardman, R. (1979). Over to you: Oral-aural skills for advanced students of English. Cambridge University Press.
芝加哥风格引文Boardman, Roy. Over to You: Oral-aural Skills for Advanced Students of English. Cambridge, England, United Kingdom: Cambridge University Press, 1979.
MLA引文Boardman, Roy. Over to You: Oral-aural Skills for Advanced Students of English. Cambridge University Press, 1979.
警告：这些引文格式不一定是100％准确.